Subject: Re: PTHREAD_CONCURRENCY and large SMP (8 CPUs)
To: Nicolas Joly <>
From: Chuck Silvers <>
List: current-users
Date: 12/01/2005 08:38:49
On Thu, Dec 01, 2005 at 03:48:57PM +0100, Nicolas Joly wrote:
> Hi,
> While playing with a 8 CPUs amd64 machine (4x dual-core 865 Opterons),
> i noticed that a simple threaded program (source attached) does not
> work with PTHREAD_CONCURRENCY >= 6. I already tested this small
> program on NetBSD/i386 and NetBSD/amd64, but never with 8 CPUs.
> Is there anything i can tweak to make it work ?

the PTHREAD_CONCURRENCY stuff was never finished.  there is still work
to be done in both the kernel and libpthread to make it functional,
even for only 2 CPUs.  it's really easy to trigger that library assertion,
and some people have triggered kernel assertions as well.